CN111868959A - Electricity storage device - Google Patents
Electricity storage device Download PDFInfo
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- CN111868959A CN111868959A CN201980019684.0A CN201980019684A CN111868959A CN 111868959 A CN111868959 A CN 111868959A CN 201980019684 A CN201980019684 A CN 201980019684A CN 111868959 A CN111868959 A CN 111868959A
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/271—Lids or covers for the racks or secondary casings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/78—Cases; Housings; Encapsulations; Mountings
- H01G11/82—Fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors or terminals in containers or encapsulations
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
- H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
- H01M50/227—Organic material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Battery Mounting, Suspending (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
Abstract
The invention provides an electric storage device (1) which is provided with: the electric storage device is provided with an exterior body (3) having a box-shaped exterior body main body (10), a lid body (20) covering one side of the exterior body main body (10) in a predetermined direction, and an intermediate lid (30) disposed on the side closer to the one side than the end portion of the electric storage element (2) on the one side in the predetermined direction. The exterior body (10) is provided with a pair of first side walls (12A, 12B) that face each other, and a pair of first fixing sections (16A, 16B) that are provided on the pair of first side walls (12A, 12B) and to which the middle lid (30) is attached. The middle cover (30) is provided with a pair of second fixing parts (31A, 31B) which are respectively connected with the pair of first fixing parts (16A, 16B) and are arranged at a predetermined distance from each other. The outer body (10) and the middle lid (30) are fixed by connecting a pair of first fixing sections (16A, 16B) and a pair of second fixing sections (31A, 31B).
Description
Technical Field
The present invention relates to an electrical storage device.
Background
The power storage device of patent document 1 includes a power storage element and an exterior body that houses the power storage element. The exterior body includes a box-shaped exterior body main body made of resin, and a lid body attached to the exterior body main body.
When such an exterior body main body is injection molded, the exterior body main body may be deformed so as to warp inward due to a residual stress or uneven volume shrinkage caused by a pressure at the time of injection molding. When the exterior body is deformed in this manner, it is difficult to attach the lid to the exterior body, and therefore, the assembly of the exterior body is deteriorated.
In patent document 1, the exterior body main body includes a pair of side walls facing each other and a partition plate connecting the pair of side walls, and the side walls are supported by the partition plate to suppress deformation of the side walls when the exterior body main body is molded.
Documents of the prior art
Patent document
Patent document 1: japanese unexamined patent application publication No. 2014-197516
Patent document 2: japanese unexamined patent publication No. 2013-168356
Disclosure of Invention
Problems to be solved by the invention
However, in patent document 1, if the partitions are provided to divide the space inside the exterior body into a plurality of spaces, the space for housing the power storage elements decreases, and therefore the volumetric energy density decreases.
A first technical problem of the present invention is to provide an electrical storage device that ensures a volumetric energy density of the electrical storage device and prevents or suppresses deformation of an exterior body main body.
Means for solving the problems
One aspect of the present invention provides an electric storage device including: an electric storage element; an exterior body having a box-shaped exterior body main body that houses the power storage element, and a lid body that covers one side of the exterior body main body in a predetermined direction; a substantially plate-shaped intermediate cover disposed on one side of an end portion of the electric storage element in the predetermined direction; the outer package body includes: a pair of first side walls opposed to each other; a pair of second side walls connected between the pair of first side walls, respectively, and opposed to each other; a pair of first fixing parts respectively provided to the pair of first side walls and mounting the middle cover; the middle cap includes a pair of second fixing portions connected to the pair of first fixing portions, respectively, and disposed at a predetermined distance from each other, the exterior body main body and the middle cap are fixed by connecting the pair of first fixing portions and the pair of second fixing portions, and the middle cap and the power storage element are bonded to each other.
Effects of the invention
According to the present invention, the volumetric energy density of the power storage device is ensured, and deformation of the outer package body can be prevented or suppressed.
Drawings
Fig. 1 is a perspective view of a power storage device according to embodiment 1 of the present invention.
Fig. 2 is an exploded perspective view of the power storage device according to embodiment 1.
Fig. 3 is a plan view of the exterior body of embodiment 1.
Fig. 4 is a plan view of the middle cap of embodiment 1.
Fig. 5 is a plan view of the bus bar cover according to embodiment 1.
Fig. 6 is a cross-sectional view of the power storage device according to embodiment 1 taken along line VI-VI in fig. 3.
Fig. 7 is a view similar to fig. 6 showing a state in which the outer package body and the lid of the power storage device according to embodiment 1 are thermally welded to each other.
Fig. 8 is an exploded perspective view showing each component when the power storage device of embodiment 2 is disassembled.
Fig. 9 is a perspective view showing a structural relationship among the exterior body main body, the bus bar plate, and the bus bar cover according to embodiment 2.
Fig. 10A is a plan view of the exterior body main body according to embodiment 2.
Fig. 10B is a top view of the bus bar plate of embodiment 2.
Fig. 10C is a plan view of the bus bar cover according to embodiment 2.
Fig. 11 is a sectional perspective view showing a joint portion between the exterior body main body and the bus bar plate according to embodiment 2.
Fig. 12A is a plan view of the package body of the package according to the modification of embodiment 2.
Fig. 12B is a plan view of a bus bar plate of the exterior body according to the modification of embodiment 2.
Detailed Description
An electric storage device according to an embodiment of the present invention includes: an electric storage element; an exterior body having a box-shaped exterior body main body that houses the power storage element, and a lid body that covers one side of the exterior body main body in a predetermined direction; a substantially plate-shaped intermediate cover disposed on one side of an end portion of the electric storage element in the predetermined direction; the outer package body includes: a pair of first side walls opposed to each other; a pair of second side walls connected between the pair of first side walls, respectively, and opposed to each other; a pair of first fixing parts respectively provided to the pair of first side walls and mounting the middle cover; the middle cap includes a pair of second fixing portions connected to the pair of first fixing portions, respectively, and disposed at a predetermined distance from each other, and the exterior body and the middle cap are fixed by connecting the pair of first fixing portions and the pair of second fixing portions.
According to this structure, the distance between the pair of first fixing portions is defined by the prescribed distance between the pair of second fixing portions. Therefore, even when the pair of first side walls is deformed during injection molding, the deformation of the pair of first side walls of the exterior body main body can be prevented or suppressed by appropriately maintaining the distance between the pair of first side walls. Since the intermediate lid is disposed on the side closer to the end portion on the side of the power storage element, the volume of the space for housing the power storage element in the exterior body can be secured, and the volumetric energy density of the power storage element can be secured.
The package body may include a substantially rectangular bottom wall connected to the pair of first side walls and the pair of second side walls, and the pair of first side walls may be wall portions extending in an arrangement direction of the plurality of power storage elements or wall portions extending in a direction orthogonal to the arrangement direction.
When a plurality of power storage elements are housed in the exterior body main body, the first side wall may be a long side surface depending on the arrangement direction and the number of the power storage elements or the size of the container of the power storage elements. When the plurality of power storage elements are arranged along the first sidewall, the first sidewall is a wall portion extending in the direction in which the plurality of power storage elements are arranged, and may be a long side surface. Since the deformation of the long side surface is likely to be larger than the short side surface at the time of injection molding, the deformation of the pair of first side walls of the exterior body main body can be effectively prevented or suppressed by appropriately maintaining the distance between the long side surfaces by the pair of first fixing portions and the pair of second fixing portions. When the plurality of power storage elements are arranged along the second sidewall, the first sidewall is a wall portion extending in a direction orthogonal to the arrangement direction of the plurality of power storage elements, and may be a short side surface. In this case, since the first fixing portion fixed to the middle cap is provided on the first side wall, the first side wall can be effectively prevented or suppressed from being pressed and deformed by the expanded power storage element.
The pair of first fixing portions may be disposed at a central portion of the pair of first side walls in a direction in which the pair of first side walls extend in a cross section intersecting the predetermined direction.
The deformation of the center portion of the pair of first side walls is likely to become larger at the time of injection molding than the end portions connected to the pair of second side walls, respectively. Therefore, by appropriately maintaining the distance between the center portions of the pair of first side walls by the pair of first fixing portions and the pair of second fixing portions, deformation of the pair of first side walls of the exterior body main body can be effectively prevented or suppressed.
The pair of first side walls may include a pair of protruding portions protruding from inner surfaces of the pair of first side walls, and the pair of first fixing portions may be provided to the pair of protruding portions, respectively.
The pair of protruding portions may be reinforcing ribs provided on the exterior body main body.
According to this configuration, since the pair of projecting portions are formed by the reinforcing rib, it is not necessary to provide the reinforcing rib separately from the pair of projecting portions, and space saving can be achieved.
The electric storage device may further include a joining portion that thermally welds the outer package body and the lid body, wherein the pair of first fixing portions provided to the pair of first side walls and the pair of second fixing portions provided to the middle lid constitute fixing portions of the outer package body and the middle lid, and a position of the fixing portions on the lid body side may be located closer to the electric storage element than the joining portion in the predetermined direction.
According to this configuration, since the position of the fixing portion on the cover body side is located closer to the electricity storage element than the joining portion in the predetermined direction, the hot plate used for heat welding of the outer package body and the cover body can be prevented from interfering with the fixing portion.
The intermediate lid and the power storage element may be bonded to each other.
According to this configuration, since the middle lid is bonded to the power storage element, the middle lid can be prevented from being warped and deformed, and therefore, the distance between the pair of first side walls can be appropriately maintained, and deformation of the pair of first side walls of the exterior body main body can be effectively prevented or suppressed.
One of the pair of first fixing portions and the pair of second fixing portions may have a pin, and the other may have an insertion hole, and a tip end portion of the pin may be thermally caulked in a state where the pin penetrates the insertion hole.
According to this configuration, the outer package body and the inner lid are joined by thermally caulking the tip end portions of the pins inserted into the insertion holes. Therefore, the exterior body main body and the middle lid can be firmly coupled, and the work for coupling becomes easier than when the exterior body main body and the middle lid are coupled by bolts. Even when a plurality of pin and insertion hole combinations are provided in the outer package, the plurality of pins can be heat-staked at the same time or substantially the same time. Therefore, the coupling force between the outer package body and the middle lid can be increased, and the power storage device can be efficiently manufactured. The power storage device having the above configuration has a simple configuration and high reliability.
The pair of second fixing portions having the insertion hole may be formed in a peripheral portion of the middle cap, and the pair of first fixing portions having the pin may be formed to protrude in a direction of the middle cap at a position facing the peripheral portion of the middle cap on the outer package body.
According to this configuration, the tip of the pin can be heat-staked from above in a state where the pin of the exterior body main body penetrates the insertion hole of the middle cap. That is, the heat caulking work can be easily performed. This improves the accuracy of the operation, and as a result, improves the reliability of the power storage device.
The plurality of pins may be provided in one of the pair of first fixing portions and the pair of second fixing portions, and the plurality of pins may be arranged at positions that are not rotationally symmetrical with respect to a center of the one of the outer case main body and the middle lid when one of the outer case main body and the middle lid is viewed in plan.
According to this configuration, the plurality of holes provided in the other of the first fixing portion and the second fixing portion are arranged at positions that are not rotationally symmetrical with respect to the center of the other of the plurality of holes. Thus, since the one-to-one relationship between the plurality of pins and the plurality of insertion holes is uniquely determined, the direction (posture) of the inner lid with respect to the outer body main body when the inner lid is disposed on the outer body main body can be easily determined. That is, when the shape of the middle cap is a rotationally symmetric shape such as a regular polygon in a plan view, the possibility of the middle cap being disposed in an incorrect direction (posture) on the exterior body main body (incorrect disposition) is reduced. Therefore, it is difficult to cause a phenomenon that may cause a reduction in reliability of the power storage device, such as a reduction in manufacturing efficiency due to incorrect arrangement or damage to components due to incorrect arrangement.
The pin may be provided in plural on one of the pair of first fixing portions and the pair of second fixing portions, and one of the plural pins may have a shape, a size, or an attitude in plan view different from those of one or more other pins.
According to this configuration, since the combination of one of the plurality of pins and one of the plurality of insertion holes is uniquely determined, the direction (posture) of the middle cap with respect to the exterior body main body when the middle cap is disposed on the exterior body main body can be easily determined. That is, for example, when the shape of the inner lid is a rotationally symmetric shape such as a regular polygon in a plan view, the possibility of the inner lid being placed in an incorrect direction (posture) on the exterior body main body (incorrect placement) is reduced. Therefore, it is difficult to cause a phenomenon that may cause a reduction in reliability of the power storage device, such as a reduction in manufacturing efficiency due to incorrect arrangement or damage to components due to incorrect arrangement.
The intermediate cover may have a substantially rectangular shape in plan view, and N pins may be provided in one of the pair of first fixing portions and the pair of second fixing portions, where N is a positive odd number.
For example, assume a case where the shape of the middle lid in plan view is recognized as a rectangle as a whole, and three holes into which pins of the exterior body main body are inserted are arranged in the peripheral edge portion of the middle lid. In this case, the middle lid is rotationally symmetrical at every 180 °, and on the other hand, it is impossible to arrange the three pins on the exterior body so as to be rotationally symmetrical at every 180 °. That is, the three pins of the exterior body are arranged at positions where the portions are rotationally symmetrical at intervals of 180 °. This prevents the inner lid from being erroneously disposed with respect to the outer case body.
(embodiment mode 1)
[ Structure of Power storage device ]
Embodiment 1 of the present invention will be described below with reference to the drawings. The embodiments and modifications described below are all included or specific examples. The numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of the constituent elements, and the like shown in the following embodiments and modifications thereof are examples and do not limit the scope of the present invention. Among the components of the embodiments and the modifications thereof described below, components not described in the independent claims are described as arbitrary components. In the drawings, the dimensions and the like are not strictly illustrated.
In the following description, the longitudinal direction, the width direction, and the height direction of the power storage device 1 according to the present embodiment are sometimes referred to as the X direction, the Y direction, and the Z direction, respectively. Specifically, the direction in which the storage elements are arranged, the direction in which the long side surfaces of the container of the storage elements face each other, or the thickness direction of the container is defined as the X direction. The Y direction is defined as the direction in which the electrode terminals of one power storage element are arranged or the direction in which the short side surfaces of the container of the power storage element face each other. The Z direction is defined as the direction in which the outer package body and the middle cap of the outer package of the power storage device are arranged, the direction in which the power storage elements and the bus bars are arranged, or the vertical direction. The X direction, the Y direction, and the Z direction are directions intersecting with each other (orthogonal in the following embodiment and its modified examples). These directions represent the directions of the posture of the power storage device 1 shown in the drawings, and do not necessarily coincide with the directions of the actual usage states.
Referring to fig. 1, a power storage device 1 of the present embodiment includes a plurality of (8 in the present embodiment) power storage elements 2 (shown in fig. 2) and a hollow exterior body 3 that houses the plurality of power storage elements 2. The exterior body 3 includes an exterior body main body 10 that houses the plurality of power storage elements 2, and a lid body 20 that covers one side (upper side in fig. 1) of the exterior body main body in the Z direction (predetermined direction). As will be described later, the exterior body 10 and the lid 20 of the present embodiment are fixed by thermal fusion.
The power storage device 1 is a device that can be charged with electric power from the outside and that can discharge electric power to the outside. For example, the power storage device 1 is a battery module used for power storage, power supply, and the like. Specifically, the power storage device 1 is used as a stationary battery used for driving, starting an engine, or home use or power generation of a vehicle such as an Electric Vehicle (EV), a Hybrid Electric Vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), or a gasoline car, a motorcycle, a yacht, a snowmobile, an agricultural machine, a construction machine, or a railway vehicle for electric railways such as an electric train, a monorail, or a magnetic levitation train.
Referring to fig. 2, power storage device 1 includes a substantially plate-shaped middle lid 30 provided on one side in the Z direction (upper side in fig. 2) of the end of power storage element 2 in the Z direction. The power storage device 1 includes: the plurality of bus bars 40 electrically connecting the adjacent power storage elements 2 to each other, and the bus bar cover 50 disposed so as to cover the bus bars 40 from one side in the Z direction. In fig. 3, components (for example, circuit boards) other than the electric storage element 2, the middle cover 30, the bus bar 40, and the bus bar cover 50 are not shown.
The storage element 2 of the present embodiment is a nonaqueous electrolyte secondary battery such as a lithium ion secondary battery, and is a rectangular battery. The plurality of power storage elements 2 are arranged in the X direction and housed in the exterior body 10. Each power storage element 2 includes a positive electrode terminal 2a and a negative electrode terminal 2b on one end surface in the Z direction. The shape of the power storage elements 2 and the number of power storage elements 2 arranged are not limited. The power storage element 2 is not limited to the nonaqueous electrolyte secondary battery, and may be a secondary battery other than the nonaqueous electrolyte secondary battery, or may be a capacitor. The power storage element 2 may be a primary battery that can use the stored electric power even if the user is not charged. The power storage element 2 may be a battery using a solid electrolyte. The shape of the power storage element 2 is not limited to a square shape, and may be a cylindrical shape, a long cylindrical shape, a polygonal prism shape other than a rectangular parallelepiped, or the like.
The exterior body 10 is a box-shaped member obtained by injection molding a resin. Referring to fig. 3 together, the exterior body 10 of the present embodiment includes: a bottom wall 11, a pair of first side walls 12A, 12B facing each other, and a pair of second side walls 13A, 13B connecting the pair of first side walls 12A, 12B and facing each other. The pair of first side walls 12A, 12B and the pair of second side walls 13A, 13B form openings on one side of the exterior body 10 in the Z direction.
The exterior body 10 and the lid 20 of the exterior body 3 are made of an insulating material such as Polycarbonate (PC), polypropylene (PP), Polyethylene (PE), Polystyrene (PS), polyphenylene sulfide resin (PPs), polyphenylene ether (PPE (including modified PPE)), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyamide resin, polyether ether ketone (PEEK), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), Polytetrafluoroethylene (PTFE), polybutylene terephthalate (PBT), Polyarylethersulfone (PEs), ABS resin, or a composite material thereof. This prevents contact between the power storage element 2 and external metal members and the like, of the exterior body 3.
The bottom wall 11 is substantially rectangular and is disposed on a vertical plane (XY plane) with respect to the Z direction. Specifically, the bottom wall 11 of the present embodiment is substantially rectangular, and includes a pair of long sides extending in the X direction and a pair of short sides extending in the Y direction.
The pair of first side walls 12A and 12B of the present embodiment are substantially rectangular and are disposed on a vertical plane (XZ plane) with respect to the Y direction. That is, the pair of first side walls 12A and 12B are wall portions extending along the arrangement direction (X direction) of the power storage elements 2. The pair of first side walls 12A, 12B are connected to the long sides of the bottom wall 11. That is, the pair of first side walls 12A and 12B of the present embodiment are long side surfaces of the exterior body 10. The exterior body 10 of the present embodiment includes a protruding portion 14A protruding from the inner surface of the first side wall 12A toward the first side wall 12B, and a protruding portion 14B protruding from the inner surface of the first side wall 12B toward the first side wall 12A.
The protruding portion 14A of the present embodiment is formed by a plurality of ribs 15 formed integrally with the pair of first side walls 12A of the exterior body 10. Similarly, the pair of protruding portions 14B of the present embodiment is configured by a plurality of ribs 15 formed integrally with the pair of first side walls 12B of the exterior body 10.
The ribs 15 are ribs for reinforcing the exterior body 10. The ribs 15 project from the inner surfaces of the pair of first side walls 12A, 12B in the Y direction, respectively, and extend in the Z direction. The ribs 15 are arranged at predetermined intervals from each other in the X direction.
The first fixing portion 16A is provided in the extension portion 14A of the first side wall 12A, and the first fixing portion 16B is provided in the extension portion 14B of the second side wall 13B. The pair of first fixing portions 16A and 16B are disposed at a predetermined distance L1 from each other in the Y direction. The first fixing portion 16A of the present embodiment is configured by a plurality of pins protruding from the rib 15 provided on the first side wall 12A to one side in the Z direction. Specifically, the first fixing portion 16A includes two first pins 17 provided at the central portion a1 of the first side wall 12A and two second pins 18 provided at the side portions a2 of the first side wall 12A in the X direction. Similarly, the first fixing portion 16B is constituted by a plurality of pins protruding to one side in the Z direction from the rib 15 provided on the first side wall 12B. The first fixing portion 16B includes two first pins 17 provided in the X direction at the center portion a1 of the first side wall 12B and two second pins 18 provided in the side portions a2 of the first side wall 12B. The central portion a1 of the pair of first side walls 12A, 12B is a central region when the pair of first side walls 12A, 12B are equally divided into three regions in the direction in which the pair of first side walls 12A, 12B extend (X direction in the present embodiment) in a cross section orthogonal to the Z direction. The side portion a2 of the pair of first side walls 12A, 12B is a region located laterally of the central portion a1 in a direction (X direction in the present embodiment) in which the pair of first side walls 12A, 12B extend, respectively, in a cross section orthogonal to the Z direction.
The pair of second side walls 13A and 13B of the present embodiment is substantially rectangular and is disposed on a perpendicular plane (YZ plane) to the X direction. A pair of second side walls 13A, 13B are connected to the short sides of the bottom wall 11. That is, the pair of second side walls 13A and 13B in the present embodiment are short side surfaces of the exterior body 10.
Referring to fig. 2 and 4, middle cap 30 is substantially plate-shaped, has a substantially rectangular shape having an outer shape similar to the inner shape of outer package body 10, and is bonded to one end of power storage element 2 in the Z direction. The middle cap 30 of the present embodiment includes: the second fixing portion 31A mechanically connected to the first fixing portion 16A provided on the first side wall 12A of the package body 10, and the second fixing portion 31B mechanically connected to the first fixing portion 16B provided on the first side wall 12B of the package body 10. The pair of second fixing portions 31A and 31B are disposed at a predetermined distance L2 from each other in the Y direction. The middle cap 30 may be made of an insulating material such as PC, PP, PE, PS, PPs, PPE (including modified PPE), polyamide resin, PET, PBT, PEEK, PFA, PTFE, PEs, ABS resin, or a composite material thereof, as in the case of the exterior body 3.
The second fixing portion 31A of the present embodiment is configured by a plurality of insertion holes into which the plurality of pins 17 and 18 provided on the first sidewall 12A are inserted. Specifically, the second fixing portion 31A includes two first insertion holes 32 into which the two first pins 17 of the first sidewall 12A are inserted, and two second insertion holes 33 into which the two second pins 18 of the first sidewall 12A are inserted. Similarly, the second fixing portion 31B of the present embodiment is configured by a plurality of insertion holes into which the plurality of pins 17 and 18 provided on the first side wall 12B are inserted. Specifically, the second fixing portion 31B includes two first insertion holes 32 configured to insert the two first pins 17 of the first sidewall 12B and two second insertion holes 33 configured to insert the second pins 18 of the first sidewall 12B.
The bus bar 40 is a plate-like member made of a conductive material such as copper, a copper alloy, aluminum, an aluminum alloy, or the like. The bus bar 40 electrically connects the positive electrode terminals 2a, the negative electrode terminals 2b, or the positive electrode terminal 2a and the negative electrode terminal 2b of the power storage elements 2 adjacent in the X direction. The bus bar 40 is welded and joined to the positive electrode terminal 2a or the negative electrode terminal 2b of the electric storage element 2.
Referring to fig. 2 and 5, the bus bar cover 50 of the present embodiment includes two third insertion holes 51 configured to insert the two first pins 17 therein, and two notch portions 52 provided at positions corresponding to the two second pins 18, respectively.
Referring to fig. 6, the first fixing portion 16A and the second fixing portion 31A are mechanically connected, and the first fixing portion 16B and the second fixing portion 31B are connected, whereby the middle cap 30 and the bus bar cover 50 are fixed to the exterior body 10. The first pin 17 includes an umbrella-shaped head 17a at one end in the Z direction (upper side in fig. 6), and the middle cap 30 and the bus bar cover 50 are sandwiched between the other end surface of the head 17a of the first pin 17 in the Z direction and the one end surface of the rib 15 in the Z direction.
Similarly, the second pin 18 has an umbrella-shaped head 18a at one end in the Z direction, and the middle cap 30 is sandwiched between the other end surface of the head 18a of the second pin 18 in the Z direction and the one end surface of the rib 15 in the Z direction. The notch 52 of the bus bar cover 50 is configured to prevent the head 18a of the second pin 18 from interfering with the bus bar cover 50.
In other words, the first fixing portion 16A provided in the package body 10, the second fixing portion 31A provided in the middle cap 30, the first fixing portion 16B provided in the package body 10, and the second fixing portion 31B provided in the middle cap 30 constitute the fixing portion 60 of the package body 10 and the middle cap 30.
As described above, the peripheral edge of the opening of the outer package body 10 and the peripheral edge of the lid body 20 are heat-welded. Specifically, in the cross section shown in fig. 6, power storage device 1 of the present embodiment includes joining section 70 where outer package body 10 and lid body 20 are thermally welded. In the Z direction, a position Z1 on the lid body 20 side of the fixing portion 60 (in the present embodiment, a position of one end portion of the head portion 17a of the first pin 17 in the Z direction) is located closer to the electricity storage element 2 side than a position Z2 on the electricity storage element 2 side of the joint portion 70 (in the present embodiment, a position of the other end portion of the joint portion 70 in the Z direction).
[ production Process ]
A method for manufacturing the power storage device 1 of the present embodiment is explained below.
First, the power storage element 2 is disposed inside the outer package body 10. Next, the intermediate lid 30 coated with an adhesive on the surface in contact with the electric storage element 2 is prepared, and the first pin 17 and the second pin 18 provided in the outer body 10 are inserted into the first insertion hole 32 and the second insertion hole 33 of the intermediate lid 30, and arranged.
In this state, the head 18a of the second pin 18 is formed by heating and pressing one end portion of the second pin 18 in the Z direction, and the inner lid 30 is fixed to the exterior body 10. In general, this method of application is called "hot caulking", and in the present invention, the same processing method can be used not only for forming the head portion 18a of the second pin 18 but also for forming the head portion 17a of the first pin 17, which will be described later. The fixing method of the present invention is not limited to the heat caulking, and for example, a heat welding method of melting and joining both the head portion 18a of the second pin 18 and the middle cap 30 as the joined body may be used. The head 18a of the second pin 18 may be formed by laser irradiation, such as heat caulking, or the head 18a of the second pin 18 and the portion of the middle cap 30 in contact with each other may be melted and integrated.
Then, the bus bar 40 is disposed on the positive electrode terminal 2a or the negative electrode terminal 2b of the electric storage element 2, and the bus bar 40 is welded to the positive electrode terminal 2a or the negative electrode terminal 2b of the electric storage element 2.
The first pin 17 provided in the exterior body 10 is inserted into the third insertion hole 51 provided in the bus bar cover 50, and the bus bar cover 50 is disposed so as to cover the bus bar 40 from one side in the Z direction. In this state, the head 17a of the first pin 17 is formed by heating and pressing one end portion of the first pin 17 in the Z direction, and the middle cap 30 and the bus bar cover 50 are fixed to the exterior body 10.
Finally, as shown in fig. 7, the attachment portion 20a of the lid body 20 on the other side in the Z direction and the end portion 10a of the exterior body 10 on one side in the Z direction are thermally welded by a hot plate 80. The attachment portion 20a of the lid body 20 and the end portion 10a of the package body 10 are melted by the hot plate 80, and the melted portions are held in a state of abutting, and cooled while being pressurized, thereby fixing the lid body 20 and the package body 10.
According to this structure, the first securing portion 16A and the second securing portion 31A are connected, and the first securing portion 16B and the second securing portion 31B are connected, so the distance L1 between the pair of first securing portions 16A, 16B is defined by the prescribed distance L2 between the pair of second securing portions 31A, 31B. Therefore, even when the pair of first side walls 12A, 12B is deformed during injection molding, the deformation of the pair of first side walls 12A, 12B of the package body 10 can be prevented or suppressed by appropriately maintaining the distance between the pair of first side walls 12A, 12B. Since the intermediate lid 30 is disposed on the one side of the end portion on the one side of the power storage element 2, the volume of the space for housing the power storage element 2 in the exterior body 10 can be secured, and the volumetric energy density of the power storage element 2 can be secured.
Since the deformation of the long side surface is likely to be larger in injection molding than the short side surface, the distance between the pair of first side walls 12A, 12B as the long side surface is appropriately maintained by the pair of first fixing portions 16A, 16B and the pair of second fixing portions 31A, 31B. This can effectively prevent or suppress deformation of the pair of first side walls 12A, 12B of the exterior body 10.
The deformation of the central portion a1 of the first side wall 12A is likely to be large at the time of injection molding, as compared with the side portion a2 where the first side wall 12A and the pair of second side walls 13A, 13B are connected, respectively. Similarly, the deformation of the central portion a1 of the first side wall 12B is likely to be larger at the time of injection molding than the side portion a2 where the first side wall 12B and the pair of second side walls 13A, 13B are connected, respectively. Therefore, by appropriately maintaining the distance between the central portions a1 of the pair of first side walls 12A, 12B by the pair of first fixing portions 16A, 16B and the pair of second fixing portions 31A, 31B, deformation of the pair of first side walls 12A, 12B of the exterior body main body 10 can be effectively prevented or suppressed.
Since the extension portion 14A of the power storage device 1 is formed of the reinforcing rib 15 and the extension portion 14B is formed of the reinforcing rib 15, it is not necessary to provide the reinforcing rib separately from the pair of extension portions 14A and 14B, and space saving can be achieved.
In the Z direction, the position of the middle cap 30 and the fixing portion 60 of the outer package body 10 on the lid 20 side is located closer to the electricity storage element 2 than the joining portion 70 where the outer package body 10 and the lid 20 are thermally welded. Therefore, the hot plate 80 used for heat welding the outer package body 10 and the lid body 20 can be prevented from interfering with the fixing portion 60.
Since middle cap 30 is bonded to power storage element 2, warp deformation of middle cap 30 can be suppressed, and therefore, distance L2 between the pair of second fixing portions 31A and 31B can be appropriately maintained, and deformation of the pair of first side walls 12A and 12B of package body 10 can be effectively prevented or suppressed.
While the present invention has been described above with reference to the preferred embodiment 1, the present invention is not limited to the specific embodiment, and various modifications can be made within the spirit of the present invention described in the claims.
For example, the bus bar cover 50 may not be fixed to the exterior body 10.
The pair of first fixing portions 16A and 16B may be insertion holes, and the pair of second fixing portions 31A and 31B may be pins.
The pair of first fixing portions 16A and 16B and the pair of second fixing portions 31A and 31B may be insertion holes, or pins separate from these may be prepared.
The pair of second side walls 13A and 13B may include a pair of first fixing portions such as a plurality of pins.
In embodiment 1 described above, the first side walls 12A and 12B are specified as the long side surfaces of the package body 10, but the present invention is not limited to this, and includes a case where the first side walls 12A and 12B are the short side surfaces of the package body 10. For example, which of the long side surface and the short side surface of the exterior body 10 is formed may be changed depending on the direction in which the power storage elements 2 are arranged. Specifically, when 8 electric storage elements 2 are arranged in the Y direction unlike in embodiment 1 described above, the first side walls 12A and 12B arranged on the XZ plane serve as short side surfaces of the package body 10, and the second side walls 13A and 13B arranged on the YZ plane serve as long side surfaces of the package body 10.
In this way, when the arrangement direction of the power storage elements 2 is the Y direction, the pair of first side walls 12A and 12B are wall portions extending in the direction orthogonal to the arrangement direction of the power storage elements 2, and serve as short side surfaces of the package body 10. That is, the pair of first fixing portions 16A, 16B provided on the pair of first side walls 12A, 12B are disposed on one side and the other side of the exterior body main body 10 in the Y direction (the arrangement direction of the power storage elements 2).
The container of power storage element 2 may expand over time, and outer package body 10 of power storage device 1 may be deformed under the influence of the expansion. In particular, as in embodiment 1 described above, when the energy storage elements 2 are rectangular, the Y direction in which the energy storage elements 2 are arranged (stacked) coincides with the direction in which the energy storage elements 2 easily expand. Therefore, the pair of first side walls 12A and 12B, which are wall portions extending in the direction orthogonal to the arrangement direction of the power storage elements 2, may be affected by the deformation and most deform outward in the Y direction. In this embodiment, as described above, the pair of first fixing portions 16A, 16B fixed to the middle cap 30 are provided on the pair of first side walls 12A, 12B and are disposed on one side and the other side in the Y direction (the arrangement direction of the power storage elements 2) of the exterior body main body 10. Thus, the force with which the plurality of power storage elements 2 are deformed outward in the Y direction is consumed as the force with which the middle cap 30 is pulled outward in the Y direction, and therefore, the pair of first side walls 12A, 12B can be suppressed from being deformed outward in the Y direction.
In the above embodiment, the short side surface and the long side surface of the exterior body main body 10 are described by taking the direction in which the power storage elements 2 are arranged as an example. However, by changing the number of the plurality of power storage elements 2 arranged or changing the container size of the power storage elements 2, the short side surface and the long side surface of the exterior body 10 may be changed. In this case, by providing the pair of first fixing portions 16A, 16B for attaching the middle cap 30 to the pair of first side walls 12A, 12B, the above-described effects are exhibited in both the case where the pair of first side walls 12A, 12B are long side surfaces and the case where the pair of first side walls are short side surfaces.
In other words, when the area of the long side surface of the container of one power storage element 2 is equal to the total area of the short side surfaces of the containers of the plurality of power storage elements, the areas of the first side walls 12A and 12B and the second side walls 13A and 13B are equal to each other. In this case, although the concept of the short side surface and the long side surface does not exist, the effect of suppressing the deformation of the exterior body main body, which is the effect of the present invention, can be exhibited without change.
(embodiment mode 2)
Next, the coupling structure between the outer body main body and the middle cap of the outer body will be described in detail as embodiment 2.
Conventionally, an electric storage device including an electric storage element and an outer package is known. For example, patent document 2 discloses a power supply device including a storage container for storing a power supply device main body including a battery pack having a plurality of cells arranged in a row. Specifically, the container includes a container body for housing the power supply device body, and a lid portion for closing an opening of the container body. The lid and the vessel body are fastened by screws inserted into respective through holes provided at four corners of the lid. That is, the lid is coupled to the container body by a plurality of screws.
As described above, in the conventional power supply device, the container has a structure in which the outer case body and the member (middle lid) disposed in the opening of the outer case body are coupled to each other by a plurality of screws (bolts), and the middle lid and the outer case body can be firmly coupled to each other. However, since the bolts and the nuts are usually made of metal, for example, when the number of bolts is increased in order to more firmly couple the middle cap and the outer package body, there are problems such as an increase in the number of components and an increase in the weight of the power storage device. Since the operation of turning the bolts (or nuts) is performed for each of the plurality of bolts in sequence, there is a possibility that the efficiency of manufacturing the power storage device is lowered by more firmly bonding the middle lid and the exterior body main body.
The present invention has been made in view of the above problems, and a second object of the present invention is to provide an electric storage device including an electric storage element and an exterior body, which has a simple structure and high reliability.
One aspect of the present invention provides an electric storage device including an electric storage element and an outer package, wherein the outer package includes an outer package main body that houses the electric storage element and an intermediate lid that is disposed above the electric storage element, one of the outer package main body and the intermediate lid includes a pin, and the other of the outer package main body and the intermediate lid includes a hole, and a tip end portion of the pin is heat-staked in a state where the pin penetrates the hole.
According to this configuration, the tip end portion of the pin inserted into the hole is heat-staked, whereby the exterior body and the middle cap are coupled. Therefore, for example, the work for joining is easier than in the case where the exterior body main body and the middle lid are firmly joined and the exterior body main body and the middle lid are joined by bolts. For example, even when a plurality of pin and hole combinations are provided in the outer package, the plurality of pins can be heat-staked at the same time or substantially the same time. Therefore, the coupling force between the outer package body and the middle lid can be increased, and the power storage device can be efficiently manufactured. Thus, the power storage device of the present embodiment has a simple structure and high reliability.
The hole may be formed in a peripheral edge portion of the middle cap, and the pin may be formed in the outer package body at a position facing the peripheral edge portion of the middle cap so as to protrude in the direction of the middle cap.
According to this configuration, the pin of the exterior body main body can be thermally caulked from above with the tip of the pin penetrating the hole of the middle cap. That is, the heat caulking work can be easily performed. This improves the accuracy of the work, for example, and as a result, improves the reliability of the power storage device.
The outer package body may have a rib provided upright on an inner surface located on a side of the power storage element and extending in an arrangement direction of the middle cap and the outer package body, and the pin may be provided upright on an end portion of the rib on the middle cap side.
According to this structure, the strength of the exterior body main body is increased by the ribs, and at least a part of the middle lid is supported by the ribs. Therefore, the middle lid is more stably supported by the outer case body. This contributes to improvement in reliability of the power storage device.
The plurality of pins may be provided on one of the outer case main body and the middle cap, and the plurality of pins may be arranged at positions that are not rotationally symmetrical with respect to a center of the one of the outer case main body and the middle cap when one of the outer case main body and the middle cap is viewed in plan.
According to this configuration, the plurality of holes provided in the other of the outer body main body and the middle lid are all arranged at positions that are not rotationally symmetrical with respect to the center of the other. Accordingly, since the one-to-one relationship between the plurality of pins and the plurality of insertion holes is uniquely determined, the direction (posture) of the inner lid with respect to the outer body main body when the inner lid is disposed on the outer body main body can be easily determined. That is, when the shape of the middle cap is a rotationally symmetric shape such as a regular polygon in a plan view, the possibility of the middle cap being disposed in an incorrect direction (posture) on the exterior body main body (incorrect disposition) is reduced. Therefore, it is difficult to cause a phenomenon that may cause a reduction in reliability of the power storage device, such as a reduction in manufacturing efficiency due to incorrect arrangement or damage to components due to incorrect arrangement.
The plurality of pins may be provided on one of the outer case body and the middle lid, and the shape, size, or posture of one of the plurality of pins in a plan view may be different from the shape, size, or posture of one or more other pins in a plan view.
According to this configuration, since the combination of one of the plurality of pins and one of the plurality of holes is uniquely determined, the direction (posture) of the middle cap with respect to the outer case body when the middle cap is disposed on the outer case body can be easily determined. That is, for example, when the shape of the inner lid is a rotationally symmetric shape such as a regular polygon in a plan view, the possibility of the inner lid being placed in an incorrect direction (posture) on the exterior body main body (incorrect placement) is reduced. Therefore, it is difficult to cause a phenomenon that may cause a reduction in reliability of the power storage device, such as a reduction in manufacturing efficiency due to incorrect arrangement or damage to components due to incorrect arrangement.
The middle lid may be substantially rectangular in plan view, and N pins may be provided on one of the outer case body and the middle lid, where N is a positive odd number.
For example, assume a case where the shape of the middle lid in plan view is recognized as a rectangle as a whole, and three pins of the exterior body main body are arranged on the peripheral edge of the middle lid to be inserted into the peripheral edge of the middle lid. In this case, the middle lid is rotationally symmetrical at every 180 °, and on the other hand, it is impossible to arrange the three pins on the exterior body so as to be rotationally symmetrical at every 180 °. That is, the three pins of the package body are not arranged at positions that are rotationally symmetrical with respect to each other by 180 °, so that the middle lid is not erroneously arranged with respect to the package body.
According to the present invention, a power storage device having a simple structure and high reliability can be provided.
Hereinafter, a power storage device according to embodiment 2 of the present invention and a modification thereof will be described with reference to the drawings.
In the following description, for example, the X-direction plus side indicates the arrow direction side of the X-axis, and the X-direction minus side indicates the side opposite to the X-direction plus side. The Y direction and the Z direction are also the same.
[ full description of the Power storage device 1a ]
The basic configuration of the power storage device 1a of the present embodiment is common to the basic configuration of the power storage device 1 of embodiment 1. In the following description of power storage device 1a, the description of the common matters with power storage device 1 of embodiment 1 may be omitted. In appearance, there is no significant difference between the power storage device 1a and the power storage device 1, and therefore, an external perspective view of the power storage device 1a is omitted.
A power storage device 1a according to embodiment 2 will be fully described with reference to fig. 8. Fig. 8 is an exploded perspective view showing each component in the case where power storage device 1a according to embodiment 2 is exploded.
As shown in fig. 8, power storage device 1a includes power storage element 2 and package 110 that houses power storage element 2. In the present embodiment, 8 power storage elements 2 are housed in the outer case 110. The package 110 includes a package body 112 housing the plurality of power storage elements 2, and an intermediate lid 117 disposed above the plurality of power storage elements 2. In the present embodiment, the exterior body 110 further includes a lid 111 disposed so as to cover the upper side of the middle lid 117. Inside the exterior body 110, in addition to the plurality of power storage elements 2, a plurality of bus bars 133 held by the middle lid 117, bus bar covers 160 and 170, and a connection unit 180 including a control circuit and the like are housed.
The exterior 110 is a rectangular (box-like) container (module case) constituting the exterior of the power storage device 1 a. That is, outer package 110 is a member for fixing a plurality of power storage elements 2, intermediate lid 117, and the like at predetermined positions and protecting these elements from impact and the like.
The lid 111 included in the package 110 is a rectangular member that closes the opening of the package body 112, and includes the positive-side external terminal 91 and the negative-side external terminal 92. The external terminals 91 and 92 are electrically connected to the plurality of power storage elements 2 via the connection unit 180 and the bus bar 133, and the power storage device 1a charges electric power from the outside and discharges electric power to the outside via the external terminals 91 and 92. The external terminals 91 and 92 are formed of a conductive member made of metal such as aluminum or aluminum alloy. The exterior body 112 is a bottomed rectangular tubular case (frame body) having an opening formed therein, and houses the power storage element 2 and the like.
The electric storage elements 2 have a flat rectangular parallelepiped shape (square shape), and in the present embodiment, 8 electric storage elements 2 are arranged in the X direction.
Specifically, the electric storage element 2 includes a metal container 21, and a metal electrode terminal 22 (a positive electrode terminal and a negative electrode terminal) is provided on a lid portion of the container 21. The electrode terminals 22 (positive electrode terminal and negative electrode terminal) are disposed so as to protrude from the lid portion of the container 21 toward the middle lid 117 (upward, i.e., the plus sign side in the Z direction). The electrode terminal 22 is connected to the external terminals 91 and 92 via at least one bus bar 133 and the connection unit 180, whereby the power storage device 1a can charge electric power from the outside and discharge electric power to the outside. A liquid injection portion for injecting an electrolyte with oil may be provided in the lid portion of the container 21. An electrode body (both referred to as an electric storage element or an electric power generation element) and collectors (a positive electrode collector and a negative electrode collector) are disposed inside the container 21, and an electrolyte (nonaqueous electrolyte) is sealed therein.
The bus bar 133 is a rectangular plate-like member that is arranged on at least two power storage elements 2 while being held by the middle lid 117, and electrically connects the electrode terminals 22 of the at least two power storage elements 2 to each other. In the present embodiment, the 5 bus bars 133 are used to connect the power storage elements 2 in parallel for every two to form 4 groups of power storage element groups, and the 4 groups of power storage element groups are connected in series.
The connection unit 180 is a unit having a plurality of bus bars, a control board, and the like, and connects the electric storage element group including 8 electric storage elements 2 to the external terminals 91 and 92. In the present embodiment, the connection unit 180 is fixed to the middle cap 117. The detection circuit and the control circuit may be formed on separate substrates. The connection unit 180 may not have a control substrate. In this case, for example, a control device disposed outside power storage device 1a may control charging and discharging of each power storage element 2.
The middle cap 117 is an example of a middle cap disposed above the plurality of power storage elements 2 (on the side where the electrode terminals 22 are disposed), and in the present embodiment, is a member that holds the bus bar 133. More specifically, the middle cover 117 is a member capable of holding a plurality of bus bars 133, the connection unit 180, other wires, and the like (not shown), and performing position regulation of these members. The middle cover 117 is provided with a plurality of bus bar openings 117a for holding the plurality of bus bars 133 and exposing a part of each of the plurality of bus bars 133 to the side of the plurality of power storage elements 2. The middle cap 117 also has a function of restricting upward movement (plus sign in the Z direction) of the plurality of power storage elements 2, for example, by being fixed to the outer package body 112 by a method described later.
The middle cover 117 disposed above the plurality of power storage elements 2 is also referred to as a "bus bar frame", for example.
The bus bar covers 160 and 170 are resin members covering the plurality of bus bars 133 from above, and serve to electrically insulate the plurality of bus bars 133 from the connection unit 180, for example.
[ Structure for connecting bus bar plate to exterior body Main body ]
In power storage device 1a configured as described above, middle cap 117 is bonded to outer body 112 of outer body 110 by thermal caulking. The coupling structure between the middle cap 117 and the exterior body 112 according to the present embodiment will be described below with reference to fig. 9 to 11.
Fig. 9 is a perspective view showing the structural relationship among the exterior body 112, the middle lid 117, and the bus bar covers 160 and 170 according to embodiment 2. Fig. 10A is a plan view of the exterior body main body 112 according to embodiment 2. Fig. 10B is a plan view of the middle cap 117 according to embodiment 2. Fig. 10C is a plan view of the bus bar covers 160 and 170 according to embodiment 2. Fig. 11 is a sectional perspective view showing a joint portion between the exterior body 112 and the middle cap 117 according to embodiment 2. Fig. 11 is a perspective view of the power storage device 1a cut along a YZ plane passing through the V-V line shown in fig. 10A, and other elements such as the power storage element 2 are not shown.
In the present embodiment, as shown in fig. 9 and 10A, a plurality of pins 115 are provided on the package body 112 of the package 110. Specifically, 8 pins 115 provided with marks 115a to 115h in fig. 10A are provided in the package body 112. The pin 115 is an example of a pin provided in the pair of first fixing portions or the pair of second fixing portions. In the present embodiment, the pins 115a to 115d correspond to the first fixing section 16A of embodiment 1, and the pins 115e to 115h correspond to the first fixing section 16B of embodiment 1.
These pins 115 are inserted into holes 118 provided in the middle cap 117, and the tip ends of the pins 115 are heat-staked. Specifically, 8 holes 118 provided with marks 118a to 118h in fig. 10B are provided in the middle cap 117, and pins 115 having the same letter as the hole 118 are inserted into the 8 holes 118. For example, a pin 115a is inserted into the hole 118a, and a pin 115b is inserted into the hole 118 b. Then, the tip end portion of the pin 115 is heat caulked in a state where the pin 115 passes through the hole 118. The hole 118 is an example of an insertion hole provided in the pair of first fixing portions or the pair of second fixing portions. In the present embodiment, the holes 118a to 118d correspond to the second fixing portion 31A of embodiment 1, and the holes 118e to 118h correspond to the second fixing portion 31B of embodiment 1.
That is, the tip of the pin 115 is heated to melt and then cooled to solidify, whereby a head 116 is formed at the tip of the pin 115 (in fig. 11, the pin 115b), as shown in fig. 11. Here, the head 116 is a portion provided integrally with the pin 115, and has an outer diameter larger than a portion between the root of the pin 115 and the head 116. The head 116 is a portion formed by melting and then solidifying, and thus is formed in a shape that is in close contact with an object to be joined (in fig. 11, the bus bar cover 170). Alternatively, the head 116 is formed in a state of being fused together with the object to be bonded. Thereby, the middle cap 117 is firmly coupled to the exterior body 112.
In the present embodiment, among 8 heat-caulking portions or 4 portions of the exterior body 110, the bus bar cover 160 or 170 is fixed to the exterior body 112 together with the middle cap 117. Specifically, as shown in fig. 10C, holes 165f and 165g are formed in the bus bar cover 160, and holes 175b and 175C are formed in the bus bar cover 170. The pins 115 penetrating the holes 118 of the middle cap 117 disposed at the corresponding positions are inserted into the holes 165f, 165g, 175b, and 175c, respectively, and in this state, the tip end portions of the pins 115 are heat-staked. In this way, the bus bar covers 160 and 170 are joined to the outer package body 112 together with the middle lid 117 by thermal caulking, whereby the manufacturing efficiency of the power storage device 1a can be improved, and the bus bar covers 160 and 170 can be firmly fixed to the outer package body 112.
In the present embodiment, the outer package body 112 has pins 115, and the middle cap 117 has holes 118 into which the pins 115 are inserted. However, the positions of the pins 115 and the holes 118 are not limited to this, and it is sufficient that one of the outer package body 112 that houses the power storage element 2 and the middle cap (middle cap 117 in the present embodiment) disposed above the power storage element 2 has the pins 115 and the other has the holes 118. For example, a flange portion extending outward is provided at the periphery of the opening in the upper portion of the outer body main body 112, and a hole 118 is formed in the flange portion. A portion facing the flange portion may be provided at the peripheral edge portion of the middle cap 117, and the pin 115 protruding downward may be provided at the portion. In this case, the outer case body 112 housing the power storage element 2 and the middle cap 117 as a middle cap disposed above the power storage element 2 can be firmly joined by heat caulking.
As described above, power storage device 1a according to the present embodiment is power storage device 1a including power storage element 2 and package 110, and package 110 includes package body 112 housing power storage element 2 and intermediate lid 117 disposed above power storage element 2. One of the outer body main body 112 and the middle cap 117 has a pin 115, and the other has a hole 118, and the tip end of the pin 115 is heat-caulked in a state where the pin 115 penetrates the hole.
According to this configuration, the tip end portion of the pin 115 inserted into the hole 118 is heat-caulked, whereby the exterior body 112 and the middle cap 117 are coupled. Therefore, for example, the outer package body 112 and the middle cap 117 can be firmly joined. The work for joining is easier than when the outer package body 112 and the middle lid 117 are joined by bolts. For example, even when a combination of a plurality of pins 115 and holes 118 is provided in the package 110 as in the present embodiment, the plurality of pins 115 may be heat-staked simultaneously or substantially simultaneously using a heat-staking device. Therefore, the coupling force between the outer case body 112 and the middle lid 117 can be increased, and the power storage device 1a can be efficiently manufactured. As described above, the power storage device 1a of the present embodiment is a power storage device 1a having a simple structure and high reliability.
When bolts are used for coupling the package body 112 and the middle lid 117, it is necessary to provide holes in one of the package body 112 and the middle lid 117 and embed a head of the bolt or a nut in the other. Therefore, when viewed from the axial direction of the bolt, the other requires a region for embedding the head of the screw or the nut. This may uselessly waste space inside, for example, the exterior body 110. In this regard, in power storage device 1a of the present embodiment, pin 115 protruding toward one of outer body main body 112 and middle cap 117 may be provided on the other. Therefore, there is no need to provide a residual area in the lower portion of the pin 115. For example, when an excessive impact is applied to the power storage device 1a, even when the resin pin 115 is scattered, the scattered pin 115 is less likely to damage other members.
In the joining of the exterior body 112 and the middle lid 117, in the case of the heat caulking, for example, a waiting time for curing the adhesive is advantageously not generated, as compared with the case of using the adhesive without using the heat caulking.
In the power storage device 1a according to the present embodiment, more specifically, as shown in fig. 10B, for example, the hole 118 is formed in the peripheral edge portion of the middle lid 117. As shown in fig. 10A, for example, the pin 115 is formed to protrude in the direction of the middle cap 117 at a position of the package main body 112 facing the peripheral edge portion of the middle cap 117.
According to this configuration, the pin 115 of the package body 112 can be heat-staked from above with the tip of the pin 115 penetrating the hole 118 of the middle cap 117. That is, the heat caulking work can be easily performed. This improves the accuracy of the work, for example, and as a result, improves the reliability of the power storage device 1 a.
In the power storage device 1a of the present embodiment, as shown in fig. 9 and 10A, for example, a plurality of ribs 113 are provided on an inner surface 112a of the outer package body 112. The pin 115 is disposed at an upper end of a portion of the plurality of ribs 113. That is, in the present embodiment, the package body 112 has a rib 113 provided upright on an inner surface 112a located on a side of the power storage element 2 and extending along the arrangement direction (Z direction in the present embodiment) of the middle cap 117 and the package body 112. The pin 115 is erected on an end portion of the rib 113 on the middle cap 117 side. The plurality of ribs 113 of the present embodiment are an example of the protruding portion.
By providing the ribs 113 on the inner surface 112a of the package body 112 in this manner, the strength of the package body 112 is improved. In this way, the pin 115 is provided at the upper end of the rib 113 extending in the direction parallel to the protruding direction of the pin 115, and the middle cap 117 is supported by the rib 113. Therefore, the middle lid 117 is more stably supported by the exterior body 112. This contributes to improvement in reliability of the power storage device 1 a.
In the power storage device 1a of the present embodiment, a plurality of pins 115 are provided on the outer package body 112, and the plurality of pins 115 are arranged at positions that are not rotationally symmetrical with respect to the center of the outer package body 112 when the outer package body 112 is viewed in plan. Specifically, as shown in fig. 10A, in the package main body 112 having a substantially rectangular shape in plan view, 8 pins 115 (pins 115a to 115h in fig. 10A) are arranged at positions that are not rotationally symmetrical with respect to the center point Pa of the package main body 112. In other words, the positions of the 8 pins 115 are matched before and after the rotation only when the package body 112 is rotated by an integral multiple of 360 ° around the center point Pa. Therefore, it can be said that the 8 holes 118 into which the 8 pins 115 are inserted are also the same. That is, as shown in fig. 10B, in the middle cap 117 having a substantially rectangular shape in plan view, 8 holes 118 (holes 118a to 118h in fig. 10B) are arranged at positions that are not rotationally symmetrical with respect to the center point Pb of the middle cap 117. In other words, the positions of the 8 holes 118 are matched before and after the rotation only when the middle cap 117 is rotated by an integral multiple of 360 ° about the center point Pb.
In the present embodiment, as described above, the middle cover 117 has a substantially rectangular shape in plan view. Therefore, for example, when the middle cap 117 is disposed on the exterior body main body 112 in the posture shown in fig. 10A, it is not easy to immediately determine whether the middle cap 117 should be disposed in the direction (posture) shown in fig. 10B or in the direction (posture) rotated by 180 ° about the center point Pb. That is, when the shape of the middle cap to be disposed on the exterior body main body 112 is rotationally symmetrical at predetermined angles (for example, 360 °/N (N is an integer of 2 or more)) such as a rectangle, a regular polygon, or an ellipse in a plan view, it is difficult to determine which direction (posture) the middle cap should be disposed on the exterior body main body 112 from the outer shape thereof. In the present embodiment, the middle lid disposed on the outer package body 112 is the middle lid 117 holding the plurality of bus bars 133, and the plurality of electrode terminals 22 included in the plurality of power storage elements 2 are also located at positions rotationally symmetrical at 180 ° intervals, as in the middle lid 117. That is, even when the middle cover 117 is rotated by 180 ° about the center point Pb from the standard posture, two or more electrode terminals 22 that can be joined are present directly below the respective bus bars 133. Therefore, if the middle lid 117 is disposed with respect to the package body 112 in a state rotated by 180 ° from the normal posture (that is, if an erroneous disposition occurs), the bus bar 133 and the electrode terminal 22 may be joined together, and thus a manufacturing error may occur. Therefore, from the viewpoint of improving the production efficiency of the power storage device 1a, it is very important to suppress the erroneous arrangement of the middle lid 117.
In this regard, in the present embodiment, the one-to-one relationship between the plurality of pins 115 of the exterior body 112 and the plurality of holes 118 of the middle cap 117 is uniquely determined. That is, when the arrangement layout of the plurality of holes 118 of the middle cap 117 and the arrangement layout of the plurality of pins 115 of the package body 112 are observed, it is possible to easily determine in which direction (posture) the middle cap 117 should be arranged on the package body 112. That is, the possibility of erroneous arrangement of the middle cap 117 with respect to the package body 112 is reduced. Therefore, it is difficult to cause a phenomenon that may cause a reduction in reliability of the power storage device 1a, such as a reduction in manufacturing efficiency due to incorrect arrangement or damage to components due to incorrect arrangement. .
The above-described effects can be similarly achieved when the outer package body 112 has the plurality of holes 118 and the middle cap 117 has the plurality of pins 115. That is, in the case where the plurality of pins 115 are provided in the middle cap 117, if the plurality of pins 115 are arranged at positions that do not form rotational symmetry with respect to the center of the middle cap 117 in a plan view, the possibility of erroneous arrangement of the middle cap 117 with respect to the exterior body 112 is reduced.
In the present embodiment, for example, as shown in fig. 8, two bus bar covers 160 and 170 are arranged corresponding to the plurality of bus bars 133 arranged in two rows, and both the bus bar covers 160 and 170 have a shape similar to a long bar shape. Therefore, for example, it is not easy to determine which of the bus bar covers 160 and 170 should be disposed on the plus side (or minus side) in the Y direction with respect to the exterior body main body 112 in the posture shown in fig. 10A, from the outer shapes of the bus bar covers 160 and 170. However, the arrangement layout of the holes 165g and 165f of the bus bar cover 160 and the arrangement layout of the holes 175b and 175c of the bus bar cover 170 are significantly different. Specifically, the holes 175b and 175c of the bus bar cover 170 are arranged relatively close to each other, and the holes 165g and 165f of the bus bar cover 160 are arranged relatively far from each other. Therefore, when the arrangement layout of the plurality of holes of the bus bar covers 160 and 170 and the arrangement layout of the plurality of pins 115 of the exterior body main body 112 are observed, it can be easily determined that the bus bar cover 170 should be arranged on the Y-direction plus sign side. That is, the possibility of erroneous arrangement of the bus bar covers 160 and 170 with respect to the exterior body 112 is reduced. Therefore, it is difficult to cause a phenomenon that may cause a reduction in reliability of the power storage device 1a, such as a reduction in manufacturing efficiency due to incorrect arrangement or damage to components due to incorrect arrangement. .
Although the power storage device 1a of embodiment 2 has been described above, the exterior body 110 included in the power storage device 1a may include pins or holes in a different manner from the manner shown in fig. 9 to 11. Therefore, a modification of the outer package 110 about the pins and holes for coupling the outer package body and the middle cap will be described below centering on the difference from embodiment 2.
(modification example)
Fig. 12A is a plan view of the package body 212 of the package according to the modification of embodiment 2. Fig. 12B is a plan view of the middle cap 217 of the exterior body according to the modification of embodiment 2. In fig. 12A and 12B, the arrangement positions and shapes of the pins and the holes are clearly shown, and therefore, the shapes of the entire package body 212 and the middle cap 217 are schematically shown while omitting the illustration of the structure relating to the pins and the holes. In fig. 12B, the areas of the plurality of holes formed in the middle cap 217 are marked with dots.
The package body 212 shown in fig. 12A is a member that houses a plurality of power storage elements 2, similar to the package body 112 of embodiment 2, and the middle cap 217 shown in fig. 12B is an example of a middle cap that is disposed above the plurality of power storage elements 2, similar to the middle cap 117 of embodiment 2. That is, the package 110 of the present modification includes a package body 212 and an intermediate lid 217.
In this modification, the package body 212 includes 4 pins 215a to 215d, and the 4 pins 215a to 215d are disposed at the upper end of the rib 213. The middle cap 217 has 4 holes 218a to 218 d. Pins marked with the same letter as the 4 holes 218a to 218d are inserted into the holes, respectively. For example, the pin 215a is inserted into the hole 218a, and the pin 215b is inserted into the hole 218 b. In addition, the tip end portion of the pin is heat-staked in the state of the pin through-hole.
The 4 pins 215a to 215d are arranged at rotationally symmetrical positions in a plan view. That is, the 4 holes 218a to 218d corresponding to the 4 pins 215a to 215d are also arranged at positions in the middle cap 217 that are rotationally symmetrical in plan view, similarly. However, in the present modification, the shape of the pin 215a of the pins 215a to 215d is different from that of the other pins 215b to 215 d. That is, the shape of the hole 218a corresponding to the pin 215a is different from the other holes 218b to 218 d. Therefore, when the middle cap 217 is disposed on the package body 212, the pin 215a and the hole 218a are easily associated with each other, and as a result, the direction (posture) of the middle cap 217 with respect to the package body 212 is also easily determined.
As described above, in the present modification, the exterior body main body 212 is provided with the plurality of pins 215a to 215d, and the shape of one pin 215a of the plurality of pins 215a to 215d as viewed in plan is different from the shapes of the other pins 215b to 215 d.
According to this configuration, since the combination of one of the plurality of pins and one of the plurality of holes is uniquely determined, the direction (posture) of the middle cap 217 with respect to the exterior body main body 212 in the case where the middle cap 217 is disposed on the exterior body main body 212 can be easily determined. That is, when the shape of the middle cap 217 in plan view is rotationally symmetric at predetermined angular intervals as shown in fig. 12B, the possibility of erroneous placement of the middle cap 217 is reduced. Therefore, it is difficult to cause a phenomenon that may cause a reduction in reliability of the power storage device 1a, such as a reduction in manufacturing efficiency due to incorrect arrangement or damage to components due to incorrect arrangement. .
One pin 215a of the plurality of pins 215a to 215d may have a different size or posture in plan view from the other pins 215b to 215 d. For example, assume a case where all of the plurality of pins 215a to 215d have a regular triangle shape in plan view similar to the pin 215 a. In this case, if the posture of the pin 215a is a posture in which the vertex of the regular triangle is directed to the Y direction plus sign side in a plan view and the postures of the other pins 215b to 215d are directed to the Y direction minus sign side in a plan view, the combination of the pin 215a and the hole 218a is easily specified. The size of the pin 215a is also the same as that of the other pins 215b to 215d in plan view.
The shape, size, or posture of one pin 215a of the plurality of pins 215a to 215d in plan view need not be different from the shape, size, or posture of all the other pins 215b to 215d in plan view. For example, the shape of the pin 215a in plan view may be the same as the shape of the pin 215b or 215d in plan view, and may be different from the shapes of the two remaining pins in plan view. In this case as well, the direction (posture) of the middle cap 217 with respect to the exterior body 212 is easily determined.
The shape of each of the plurality of pins 215a to 215d in plan view may be different from the shape of all the other pins. That is, each of the plurality of pins 215a to 215d may have a unique shape in plan view. In this case, the direction (posture) of the middle cap 217 with respect to the exterior body 212 is easily determined.
(other embodiment modes related to embodiment 2)
The power storage device of the present invention has been described above based on embodiment 2 and its modified example. However, the present invention is not limited to embodiment 2 and the modified examples described above. Various modifications that may occur to those skilled in the art to the embodiment 2 or the modified example, or a combination of a plurality of the components described above are included in the scope of the present invention, as long as the modifications do not depart from the spirit of the present invention.
In embodiment 2, as in embodiment 1, the intermediate lid 117 may be bonded to the plurality of power storage elements 2. Thereby, the middle cap 117 functions as a member for restraining the plurality of power storage elements 2. This is significant when the plurality of power storage elements 2 arranged in the package body 112 are not constrained in the arrangement direction. The pin 115 of one of the middle cap 117 and the package body 112 is inserted into the hole 118 of the other, whereby the middle cap 117 is temporarily fixed to the package body 112. Therefore, when the intermediate lid 117 and the plurality of power storage elements 2 are bonded, the intermediate lid 117 can be temporarily fixed without using a jig until the adhesive is cured.
In embodiment 2 and the modification, there are a plurality of combinations of pins and holes for coupling the exterior body main body and the middle lid, but only one of the combinations may be used. For example, in the case where only one pin is provided in the exterior body and only one hole is provided in the middle lid, if the pin is located at a position other than the center of the exterior body in a plan view, the pin is located at a position which is not necessarily rotationally symmetrical with respect to the center of the exterior body. The position of the hole of the middle cap is also a position that is not necessarily rotationally symmetrical with respect to the center of the middle cap. Therefore, when the shape of the middle cap is rotationally symmetrical at predetermined angles (other than 360 °) in a plan view, the middle cap is not erroneously disposed with respect to the exterior body. In this case, the exterior body main body and the middle cap may be joined to each other by a predetermined method such as adhesion, fitting, welding, or screwing, at a portion different from the position where the pin and the hole are arranged.
For example, if the middle cap is substantially rectangular in plan view, if the number of combinations of the pins and the holes is odd, the middle cap is not erroneously disposed with respect to the outer case body. That is, the middle lid may have a substantially rectangular shape in plan view, and N (N is a positive odd number) pins may be provided on one of the outer body main body and the middle lid. For example, a case is assumed in which the shape of the middle lid in plan view is recognized as a rectangle as a whole, and three holes into which pins of the exterior body main body are inserted are arranged in the peripheral edge portion of the middle lid. In other words, it is assumed that three pins are disposed at positions facing the peripheral edge portion of the middle cap in the outer package body. In this case, the middle cap is rotationally symmetrical at every 180 °, and on the other hand, it is impossible to dispose the three pins on the exterior body so as to be rotationally symmetrical at every 180 °. That is, the three pins of the exterior body are not rotationally symmetrical at 180 ° intervals, so that the middle lid is not erroneously disposed with respect to the exterior body.
In embodiment 2 and the modification, the plurality of pins are dispersedly arranged only on the peripheral edge portions on the plus side and the minus side in the Y direction (i.e., the peripheral edge portions parallel to the X direction) of the exterior body main body in a plan view, but the arrangement positions of the pins are not limited to this. For example, in a plan view, one or more pins may be arranged only on the peripheral edge portion of either the plus side or the minus side in the Y direction of the exterior body main body. For example, in a plan view, one or more pins may be arranged on the peripheral edge of either the plus side or the minus side in the Y direction of the exterior body main body and on the peripheral edge of either the plus side or the minus side in the X direction of the exterior body main body. For example, one pin may be provided at each of the peripheral edges of the outer body main body on the Y-direction plus side and the minus side (or the X-direction plus side and the minus side). That is, only a combination of two sets of pins and holes may be used for the coupling of the exterior body main body and the middle lid, and in this case, the two sets may be disposed at positions facing each other in a plan view. This improves the stability of the middle cap with respect to the outer package body, for example.
That is, the positions of the pin and hole combinations disposed in the pin and hole of the outer body main body and the middle cap may be appropriately determined in consideration of, for example, stability after the middle cap and the outer body main body are joined, and easiness of the heat caulking work. As described above, the arrangement position of the combination of one or more pins and holes is determined in consideration of such things as the plurality of pins being arranged at non-rotationally symmetrical positions in plan view, whereby the effect of suppressing erroneous arrangement of the middle lid with respect to the exterior body can be obtained.
In embodiment 2 and the modification, the middle lid coupled to the exterior body main body by the combination of the pin and the hole is a bus bar plate. However, the middle lid coupled to the exterior body may be a member different from the bus bar plate, for example, if the middle lid is a member that spans the opening of the exterior body.
In embodiment 2, the lid body 111 disposed above the middle lid 117 may be realized as a middle lid coupled to the exterior body main body by a combination of pins and holes. That is, the lid 111 and the outer case body 112 can be joined by inserting a pin provided on one of the outer case body 112 and the lid 111 into a hole provided on the other and thermally caulking the tip portion.
A tray or a frame that holds an electrical device such as a control board without holding the plurality of bus bars 133 may be handled as an intermediate lid that is coupled to the exterior body main body by a combination of pins and holes. By disposing the electric storage elements 2 above without supporting the holding function of some components, the components that restrict the upward movement of the electric storage elements 2 can be handled as an intermediate lid. That is, the middle lid coupled to the exterior body main body by the pin and hole combination does not need to have a shape that completely covers the plurality of power storage elements 2. For example, if the opening of the exterior body located above the plurality of power storage elements 2 is a member that extends from one end to the other end in a predetermined direction in a plan view, the member can be handled as an intermediate lid that is coupled to the exterior body by a combination of pins and holes. In other words, if the member is disposed above the plurality of power storage elements 2 so as to cross the space of the region facing the plurality of power storage elements 2, the member can be handled as an intermediate lid joined to the exterior body main body by a combination of pins and holes. That is, a highly reliable power storage device can be obtained by thermally caulking the tip end portion of the pin in a state where the pin is provided on one of the member and the outer case body and the pin is inserted into the hole provided on the other.
The outer package provided in power storage device 1a need not be box-shaped and need not cover a plurality of power storage elements 2 over the entire circumference. For example, the outer package body of the outer package may be configured by end plates disposed on both sides of the arrangement direction (X direction in embodiment 2) of the plurality of power storage elements 2, and a connecting member connecting these end plates. In this case, for example, a plurality of pins are provided at the upper end of the connecting member, and a plurality of holes are provided at the bus bar plate. The tip portion is heat-staked with the plurality of pins inserted through the holes, respectively. In this way, the bus bar plate as the middle cover disposed above the plurality of power storage elements 2 can be firmly fixed to the exterior body main body (combination of the pair of end plates and the connecting member).
The present invention also includes a configuration in which the constituent elements included in the above embodiments 1 and 2 and the modifications thereof are arbitrarily combined and constructed.
Industrial applicability
The present invention is applicable to an electric storage device including an electric storage element, such as a lithium ion secondary battery.
Description of the reference numerals
1 electric storage device
2 electric storage element
2a positive terminal
2b negative electrode terminal
3. 110 outer package
10. 112, 212 outer package body
11 bottom wall
12A, 12B first side wall
13A, 13B second side wall
14A, 14B extension
15. 113, 213 Ribs
16A, 16B first fixing part
17 first pin
17a, 116 head
18 second pin
20. 111 cover
21 container
22 electrode terminal
30. 117, 217 middle cover
31A, 31B second fixing part
32 first insertion hole
33 second through hole
40. 133 bus bar
50. 160, 170 bus bar cover
51 third through hole
52 cut out portion
60 fixed part
70 joint part
80 hot plate
91. 92 external terminal
115. 115 a-115 h, 215 a-215 d pins
117a bus bar opening
118. 118 a-118 h, 165f, 165g, 175b, 175c, 218 a-218 d
166e, 116h, 176a, 176d opening
180 connection unit
Claims (11)
1. An electrical storage device is provided with:
an electric storage element;
an exterior body having a box-shaped exterior body main body that houses the power storage element, and a lid body that covers one side of the exterior body main body in a predetermined direction;
a substantially plate-shaped intermediate cover disposed on one side of an end portion of the electric storage element in the predetermined direction;
the outer package body includes:
a pair of first side walls opposed to each other;
a pair of second side walls connected between the pair of first side walls, respectively, and opposed to each other;
A pair of first fixing parts respectively provided to the pair of first side walls and mounting the middle cover;
the middle cover is provided with a pair of second fixing parts which are respectively connected with the pair of first fixing parts and are arranged at a predetermined distance from each other,
the outer case body and the middle lid are fixed by connecting the pair of first fixing portions and the pair of second fixing portions,
the middle cap and the electricity storage element are bonded.
2. The power storage device according to claim 1,
the package body includes a substantially quadrangular bottom wall connected to the pair of first side walls and the pair of second side walls,
the pair of first side walls are wall portions extending in an array direction of the plurality of power storage elements or wall portions extending in a direction orthogonal to the array direction.
3. The power storage device according to claim 1 or 2,
the pair of first fixing portions are disposed at center portions of the pair of first side walls in a direction in which the pair of first side walls extend in a cross section intersecting the predetermined direction.
4. The power storage device according to any one of claims 1 to 3,
the pair of first side walls are provided with a pair of protruding parts protruding from inner surfaces of the pair of first side walls respectively,
The pair of first fixing parts are respectively arranged on the pair of extending parts.
5. The power storage device according to claim 4,
the pair of protruding portions are reinforcing ribs provided to the exterior body main body.
6. The power storage device according to any one of claims 1 to 5,
a joining part for thermally welding the outer package body and the lid body,
the pair of first fixing portions provided to the pair of first side walls and the pair of second fixing portions provided to the middle lid constitute fixing portions of the exterior body main body and the middle lid,
the fixing portion is located closer to the power storage element than the joint portion is, in the predetermined direction, to the cover.
7. The power storage device according to any one of claims 1 to 6,
one of the pair of first fixing portions and the pair of second fixing portions has a pin, and the other has an insertion hole,
and heat-caulking a tip portion of the pin in a state where the pin penetrates the insertion hole.
8. The power storage device according to claim 7,
the pair of second fixing portions having the insertion hole are formed at the peripheral edge portion of the middle cap,
The pair of first fixing portions having the pins are formed to protrude in the direction of the middle cap at positions on the exterior body that face the peripheral edge portion of the middle cap.
9. The power storage device according to claim 7 or 8,
a plurality of pins are provided on one of the pair of first fixing portions and the pair of second fixing portions,
when one of the outer case body and the middle cap is viewed in plan, the plurality of pins are arranged at positions that are not rotationally symmetrical with respect to the center of the one.
10. The power storage device according to claim 7 or 8,
a plurality of pins are provided on one of the pair of first fixing portions and the pair of second fixing portions,
one of the plurality of pins has a shape, size, or posture in a plan view different from a shape, size, or posture of one or more other pins in a plan view.
11. The power storage device according to any one of claims 7 to 10,
the middle cover is approximately rectangular in plan view,
one of the pair of first fixing portions and the pair of second fixing portions is provided with N pins, where N is a positive odd number.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-049312 | 2018-03-16 | ||
| JP2018049050 | 2018-03-16 | ||
| JP2018049312 | 2018-03-16 | ||
| JP2018-049050 | 2018-03-16 | ||
| PCT/JP2019/007812 WO2019176560A1 (en) | 2018-03-16 | 2019-02-28 | Power storage device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111868959A true CN111868959A (en) | 2020-10-30 |
Family
ID=67907683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980019684.0A Pending CN111868959A (en) | 2018-03-16 | 2019-02-28 | Electricity storage device |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US11444351B2 (en) |
| JP (1) | JP7226427B2 (en) |
| CN (1) | CN111868959A (en) |
| DE (1) | DE112019001375T5 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102019215775A1 (en) * | 2019-10-14 | 2021-04-15 | Robert Bosch Gmbh | Battery module with at least one single cell and a cell holder for receiving the at least one single cell and a method for producing such a battery module |
| KR102480736B1 (en) * | 2019-10-25 | 2022-12-22 | 주식회사 엘지에너지솔루션 | Battery module and battery pack including the same |
| JP7371458B2 (en) * | 2019-11-26 | 2023-10-31 | 株式会社Ｇｓユアサ | Power storage device |
| JP7347224B2 (en) * | 2020-01-15 | 2023-09-20 | 株式会社デンソー | Communications system |
| JP7400488B2 (en) | 2020-01-20 | 2023-12-19 | 株式会社Ｇｓユアサ | Power storage device |
| CN114868288A (en) * | 2020-01-22 | 2022-08-05 | Cps 科技控股有限公司 | Battery cell expansion restriction with hot melt fixation |
| WO2022255162A1 (en) * | 2021-06-04 | 2022-12-08 | 株式会社Ｇｓユアサ | Power storage device |
| WO2024004975A1 (en) * | 2022-06-28 | 2024-01-04 | 株式会社Ｇｓユアサ | Electric power storage device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS6318867U (en) | 1986-07-22 | 1988-02-08 | ||
| JP3111587B2 (en) * | 1992-02-07 | 2000-11-27 | 松下電器産業株式会社 | Sealed lead-acid battery |
| JP2001135288A (en) * | 1999-11-09 | 2001-05-18 | Tookado:Kk | Structure of cover side of battery pack |
| KR100872616B1 (en) | 2004-03-31 | 2008-12-09 | 닛본 덴끼 가부시끼가이샤 | Electrical device with film covering, frame member, and housing system for electrical device with film covering |
| JP6107114B2 (en) | 2012-01-16 | 2017-04-05 | 株式会社Ｇｓユアサ | Power supply |
| JP6036095B2 (en) | 2012-09-26 | 2016-11-30 | 株式会社Ｇｓユアサ | Assembled battery |
| JP5796785B2 (en) | 2012-09-28 | 2015-10-21 | 株式会社Ｇｓユアサ | Power storage device |
| JP6191201B2 (en) | 2013-03-29 | 2017-09-06 | 株式会社Ｇｓユアサ | Power storage device |
| JP6191200B2 (en) | 2013-03-29 | 2017-09-06 | 株式会社Ｇｓユアサ | Power storage device |
| CN105960719B (en) * | 2014-02-07 | 2019-07-12 | 松下知识产权经营株式会社 | Battery module |
| JP6247608B2 (en) | 2014-07-23 | 2017-12-13 | 日立オートモティブシステムズ株式会社 | Battery pack |
| CN105470420B (en) | 2014-09-30 | 2020-01-07 | 株式会社杰士汤浅国际 | Electricity storage device |
| JP2016072230A (en) | 2014-09-30 | 2016-05-09 | 株式会社Ｇｓユアサ | Power storage device |
| JP6011950B2 (en) | 2015-03-20 | 2016-10-25 | 株式会社Ｇｓユアサ | Power storage device |
| JP6759533B2 (en) | 2015-06-12 | 2020-09-23 | 株式会社Ｇｓユアサ | Power storage device |
| JP6627286B2 (en) | 2015-06-30 | 2020-01-08 | 株式会社Ｇｓユアサ | Power storage device |
| EP3319147B1 (en) | 2015-06-30 | 2023-10-18 | GS Yuasa International Ltd. | Electricity storage device |
| US10763469B2 (en) | 2015-09-18 | 2020-09-01 | Gs Yuasa International Ltd. | Energy storage apparatus |
| JP6593155B2 (en) * | 2015-12-24 | 2019-10-23 | 株式会社豊田自動織機 | Battery pack and battery pack manufacturing method |
| JP6822048B2 (en) * | 2016-10-12 | 2021-01-27 | 株式会社Ｇｓユアサ | Power storage device |
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- 2019-02-28 JP JP2020505759A patent/JP7226427B2/en active Active
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- 2019-02-28 WO PCT/JP2019/007812 patent/WO2019176560A1/en active Application Filing
- 2019-02-28 CN CN201980019684.0A patent/CN111868959A/en active Pending
- 2019-02-28 US US16/980,705 patent/US11444351B2/en active Active
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|---|---|
| WO2019176560A1 (en) | 2019-09-19 |
| JPWO2019176560A1 (en) | 2021-03-18 |
| JP7226427B2 (en) | 2023-02-21 |
| DE112019001375T5 (en) | 2020-12-17 |
| US20210013461A1 (en) | 2021-01-14 |
| US11444351B2 (en) | 2022-09-13 |
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